Essential oil diffuser



FIG. 1 is an isometric view of a essential oil diffuser showing new design;

FIGS. 2 and 4 are side elevational views thereof;

FIG. 3 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIGS. 6 and 7 are end views thereof. 

The ornamental design for a essential oil diffuser, as shown. 